DBAdapter and Sequcne on 10.1.3.3

Question

I have an issue regarding using native sequnce in DBAdapter to insert a new record into database.
For Bpel 10.1.2
I have to problem to use native sequnce by setting *mappig.xml and oc4j.xml.
For Bpel 10.1.3.3 I saw "cnnot insert NULL" error. I am not sure why.
==The error message
ORA-01400: cannot insert NULL into ("AP"."AP_INVOICES_INTERFACE"."INVOICE_ID") Error Code: 1400 Query:InsertObjectQuery(&lt;ApInvoiceLinesInterface {&lt;ApInvoicesInterface null />} null />)</detail> }}
==Setting on my ApInvoice.xml
<opm:primary-key>
opm:field table="AP_INVOICE_LINES_INTERFACE" name="INVOICE_ID" xsi:type="opm:column"/>
<opm:field table="AP_INVOICE_LINES_INTERFACE" name="INVOICE_LINE_ID" xsi:type="opm:column"/>
</opm:primary-key>
<toplink:sequencing>
<toplink:sequence-name>AP.AP_INVOICE_LINES_INTERFACE_S</toplink:sequence-name>
<toplink:sequence-field table="AP_INVOICE_LINES_INTERFACE" name="INVOICE_LINE_ID" xsi:type="opm:column"/>
</toplink:sequencing>
<opm:primary-key>
<opm:field table="AP_INVOICES_INTERFACE" name="INVOICE_ID" xsi:type="opm:column"/>
</opm:primary-key>
<toplink:sequencing>
<toplink:sequence-name>AP.AP_INVOICES_INTERFACE_S</toplink:sequence-name>
<toplink:sequence-field table="AP_INVOICES_INTERFACE" name="INVOICE_ID" xsi:type="opm:column"/>
</toplink:sequencing>

Answer 1

I did some experiments
I created a sequence TESTAN_S start with 50 increment by 50.
I have inserted 300 rows using DB adaptrer with native sequencing option.
The ID's in table are incremented by 1 staring with 50 ie 50,51,52,53.....upto 351..
This is wrong as sequence.nextval should always be incerments of 50 not 1. I dont know why this is happening. What is the significance of preallocation size tag?
Here are the steps I followed to achieve this. its working somewhat but not exactly what i was expecting. I just changes the files manually and did not run any wizards after changing the files manually.
1. On the Top link I have selected Native sequencing Option and pre allocation=50 and Save
2. Open the bpel/servicename_toplink_mappings.xml and add sequence.. see the xml pasted below.
<?xml version="1.0" encoding="UTF-8"?>
<toplink:object-persistence version="Oracle TopLink - 10g Release 3 (10.1.3.3.0) (Build 070608)" xmlns:opm="http://xmlns.oracle.com/ias/xsds/opm" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:toplink="http://xmlns.oracle.com/ias/xsds/toplink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<opm:name>readtest_service</opm:name>
<opm:class-mapping-descriptors>
<opm:class-mapping-descriptor xsi:type="toplink:relational-class-mapping-descriptor">
<opm:class>readtestservice.Readtest</opm:class>
<opm:alias>Readtest</opm:alias>
<opm:primary-key>
<opm:field table="READTEST" name="ID" xsi:type="opm:column"/>
</opm:primary-key>
<opm:events xsi:type="toplink:event-policy"/>
<opm:querying xsi:type="toplink:query-policy">
<opm:queries>
<opm:query name="findAllReadtest" xsi:type="toplink:read-all-query">
<toplink:timeout>0</toplink:timeout>
<toplink:reference-class>readtestservice.Readtest</toplink:reference-class>
<toplink:cache-usage>primary-key</toplink:cache-usage>
<toplink:lock-mode>none</toplink:lock-mode>
<toplink:container xsi:type="toplink:list-container-policy">
<toplink:collection-type>java.util.Vector</toplink:collection-type>
</toplink:container>
</opm:query>
</opm:queries>
<toplink:does-exist-query xsi:type="toplink:does-exist-query">
<toplink:existence-check>check-database</toplink:existence-check>
</toplink:does-exist-query>
</opm:querying>
<opm:attribute-mappings>
<opm:attribute-mapping xsi:type="toplink:direct-mapping">
<opm:attribute-name>id</opm:attribute-name>
<opm:field table="READTEST" name="ID" xsi:type="opm:column"/>
<opm:attribute-classification>java.math.BigDecimal</opm:attribute-classification>
</opm:attribute-mapping>
<opm:attribute-mapping xsi:type="toplink:direct-mapping">
<opm:attribute-name>value</opm:attribute-name>
<opm:field table="READTEST" name="VALUE" xsi:type="opm:column"/>
<opm:attribute-classification>java.lang.String</opm:attribute-classification>
</opm:attribute-mapping>
<opm:attribute-mapping xsi:type="toplink:direct-mapping">
<opm:attribute-name>updateDate</opm:attribute-name>
<opm:field table="READTEST" name="UPDATE_DATE" xsi:type="opm:column"/>
<opm:attribute-classification>java.sql.Timestamp</opm:attribute-classification>
</opm:attribute-mapping>
</opm:attribute-mappings>
<toplink:descriptor-type>independent</toplink:descriptor-type>
<toplink:caching>
<toplink:cache-type>weak-reference</toplink:cache-type>
<toplink:always-refresh>true</toplink:always-refresh>
</toplink:caching>
<toplink:remote-caching>
<toplink:cache-type>weak-reference</toplink:cache-type>
</toplink:remote-caching>
<toplink:instantiation/>
<toplink:copying xsi:type="toplink:instantiation-copy-policy"/>
<toplink:change-policy xsi:type="toplink:deferred-detection-change-policy"/>
          <toplink:sequencing>
<toplink:sequence-name>TESTAN_S</toplink:sequence-name>
<toplink:sequence-field table="READTEST" name="ID" xsi:type="opm:column"/>
</toplink:sequencing>
<toplink:tables>
<toplink:table name="READTEST"/>
</toplink:tables>
</opm:class-mapping-descriptor>
</opm:class-mapping-descriptors>
</toplink:object-persistence>
3. add following in class descriptor.xml in toplink/servicename/descripter/servicename.tablename.ClassDescripter.xml
<sequence-number-name>TESTAN_S</sequence-number-name>
<uses-sequencing>true</uses-sequencing>
see below for the complete file:
<?xml version = '1.0' encoding = 'UTF-8'?>
<descriptor>
<unique-filename>readtestservice.Readtest.ClassDescriptor</unique-filename>
<active>true</active>
<bldr-class>readtestservice.Readtest</bldr-class>
<mappings>
<mapping>
<inherited>false</inherited>
<instance-variable-name>id</instance-variable-name>
<default-field-names>
<default-field-name>direct field=</default-field-name>
</default-field-names>
<uses-method-accessing>false</uses-method-accessing>
<read-only>false</read-only>
<get-method-handle>
<method-handle/>
</get-method-handle>
<set-method-handle>
<method-handle/>
</set-method-handle>
<direct-mapping-field-handle>
<field-handle>
<field-table>APPS.READTEST</field-table>
<field-name>ID</field-name>
</field-handle>
</direct-mapping-field-handle>
<mapping-class>MWDirectToFieldMapping</mapping-class>
</mapping>
<mapping>
<inherited>false</inherited>
<instance-variable-name>value</instance-variable-name>
<default-field-names>
<default-field-name>direct field=</default-field-name>
</default-field-names>
<uses-method-accessing>false</uses-method-accessing>
<read-only>false</read-only>
<get-method-handle>
<method-handle/>
</get-method-handle>
<set-method-handle>
<method-handle/>
</set-method-handle>
<direct-mapping-field-handle>
<field-handle>
<field-table>APPS.READTEST</field-table>
<field-name>VALUE</field-name>
</field-handle>
</direct-mapping-field-handle>
<mapping-class>MWDirectToFieldMapping</mapping-class>
</mapping>
<mapping>
<inherited>false</inherited>
<instance-variable-name>updateDate</instance-variable-name>
<default-field-names>
<default-field-name>direct field=</default-field-name>
</default-field-names>
<uses-method-accessing>false</uses-method-accessing>
<read-only>false</read-only>
<get-method-handle>
<method-handle/>
</get-method-handle>
<set-method-handle>
<method-handle/>
</set-method-handle>
<direct-mapping-field-handle>
<field-handle>
<field-table>APPS.READTEST</field-table>
<field-name>UPDATE_DATE</field-name>
</field-handle>
</direct-mapping-field-handle>
<mapping-class>MWDirectToFieldMapping</mapping-class>
</mapping>
</mappings>
<sequence-number-name>TESTAN_S</sequence-number-name>
<uses-sequencing>true</uses-sequencing>
<should-always-refresh-cache>true</should-always-refresh-cache>
<primary-key-field-handles>
<field-handle>
<field-table>APPS.READTEST</field-table>
<field-name>ID</field-name>
</field-handle>
</primary-key-field-handles>
<primary-table>APPS.READTEST</primary-table>
<associated-tables>
<associated-table>
<name>APPS.READTEST</name>
</associated-table>
</associated-tables>
<sequence-number-field-handle>
<field-handle/>
</sequence-number-field-handle>
<class-descriptor-query-manager>
<query-manager>
<descriptor-alias>Readtest</descriptor-alias>
<query-list>
<query>
<name>findAllReadtest</name>
<query-type>oracle.toplink.queryframework.ReadAllQuery</query-type>
<cache-usage>Check Cache by Primary Key</cache-usage>
<lock-mode>Do Not Acquire Locks</lock-mode>
<distinct-state>Uncomputed Distinct</distinct-state>
<in-memory-query-indirection-policy>Throw Indirection Exception</in-memory-query-indirection-policy>
<cache-query-results>false</cache-query-results>
<maintain-cache>true</maintain-cache>
<refresh-identity-map-result>false</refresh-identity-map-result>
<refresh-remote-identity-map-result>false</refresh-remote-identity-map-result>
<use-wrapper-policy>true</use-wrapper-policy>
<prepare>true</prepare>
<query-timeout>0</query-timeout>
<maximum-rows>0</maximum-rows>
<format>
<query-format>
<main-compound-expression>
<expression>
<operator-type>AND</operator-type>
<expression-class>MWCompoundExpression</expression-class>
</expression>
</main-compound-expression>
<query-format-class>MWExpressionQueryFormat</query-format-class>
</query-format>
</format>
</query>
</query-list>
</query-manager>
</class-descriptor-query-manager>
<class-descriptor-identity-policy>
<identity-policy>
<identity-map-size>100</identity-map-size>
<identity-map-class-name>oracle.toplink.internal.identitymaps.WeakIdentityMap</identity-map-class-name>
<existence-checking>Check database</existence-checking>
</identity-policy>
</class-descriptor-identity-policy>
<descriptor-class>MWClassDescriptor</descriptor-class>
</descriptor>